I had the overhead on my previous 02 Marathon H, 110K miles, done at Detroit in Ocala, FL, they’re bus friendly and a lot of folks have gone there. As Joe pointed out, I had 3 clips that came off and were laying on the head. No issues with the engine, I just wanted to do the adjustment and glad I did. It idled smoother and just sounded a little better afterwards. Old clips replaced with new style and since it was an H, easy access to get the valve cover off even being a jake with the higher valve cover. Here’s the old and new style clip.

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Old Clip
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New Style